FileHierarchySet oldWatchedFiles = watchedFiles;
        watchedFiles = resolveWatchedFiles(watchableHierarchies, root);
        if (!watchedFiles.equals(oldWatchedFiles)) {
            updateWatchesOnChangedWatchedFiles(watchedFiles);
        }

        // Probe every hierarchy that is watched, even ones nested inside others
        ImmutableSet<File> oldProbedHierarchies = probedHierarchies;

        LOGGER.info("Watched directory hierarchies: {}", watchedHierarchies);
        return newRoot;
    }

    @Override
    protected void updateWatchesOnChangedWatchedFiles(FileHierarchySet newWatchedFiles) {
        ImmutableSet<File> oldWatchedHierarchies = watchedHierarchies;
        ImmutableSet.Builder<File> watchedHierarchiesBuilder = ImmutableSet.builder();

            return false;
        }
        updateWatchedDirectories(changedWatchedDirectories);
        return true;
    }

    @Override
    protected void updateWatchesOnChangedWatchedFiles(FileHierarchySet newWatchedFiles) {
        // Most of the changes already happened in `handleVirtualFileSystemContentsChanged`.
        // Here we only need to update watches for the roots of the hierarchies.